Heavyweight 130gsm manilla envelopes; manufactured from strong; high-quality paper; with a subtle two tone texture and distinctive sheen.All items are Paper by Nature certified finished products - better for the environment.Peel & Seal closure featuring Power-Tac adhesive for an exceptionally secure seal.Rigid back keeps mailing flat and protected. ??,??oPlease Do Not Bend??,??"?printed on the envelope. Ideal for sending important documents; photographs; artwork etc.